Month: October 2017

A colleague gave me a 2010 MacBook Pro and I notice that it runs very slow when running on battery. Boot-up takes a very long time and everything is lagging. It is practically unusable. When the power supply is plugged in however, it works normally. I tried the usual prescribed troubleshooting from Apple to reset the SMC but that still didn’t fix the issue.

Finally I came across this discussion on Apple Support Communities. The root cause seems to be faulty temperature sensor damaged by liquid spill. Because the sensor is faulty, macOS assumes the system is overheating and drops the CPU cycle which in turns makes everything runs much slower. Read More

For better redundancy, we may want to use port channel to connect a highly available active/passive pair of Cisco ASA to a switch stack. An important aspect to know is to create separate port channels on the switch stack, one for each ASA. On each ASA, it is still a single port channel because the configuration is replicated between the units. If you group all interfaces on the switch stack into a single port channel connecting to both ASA, the port channel will not be established because of the separate ASA system IDs. A single port channel is also not desirable because you do not want traffic to be sent to the standby ASA. Read More